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Last fall, dozens of homeowners just south of the city's limits discovered an industrial solvent had polluted their wells.

Paradoxically, Farah and Shaa Yaya were among the first and last to know.

But once they became aware of the contamination, the parents of three energetic boys found themselves intertwined in a community drama. Despite assurances from public health officials, no one knows exactly how long the pollution has lingered, nor has anyone pinpointed its source. ...